﻿<html lang="en">
<head>
<meta charset="utf-8">
<title>Layui引入示例</title>

<style type="text/css">

  .nav {
      left:0;
      top: 0;
      position: absolute;
      width: 100%;
      height: 56px;
      background: rgba(255,0,0,0.5);
}
</style>
</head>
<body>
<p>这一段文字</p>
<div class="nav">
</div>
</body>
</html>